The sun is definitely over the yardarm We say that too ! Len (Portsmouth girl from old Navy family . !)
The other thing we say is : 'it must be 5o'clock somewhere in the world.. 
Or : 'Its 5pm Dehli time!' 

Btw we are not even remotely posh-, no commissioned officers in our ancestry , CPO's, 2nd Lieutenants or ratings all the way.. but there once was a ships surgeon in about the 1550's on a Tudor ship (Eeeek)